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<div class="titlepage"><div><div><h4 class="title">
<a name="asio.reference.basic_seq_packet_socket.async_send"></a><a class="link" href="async_send.html" title="basic_seq_packet_socket::async_send">basic_seq_packet_socket::async_send</a>
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<p>
          <a class="indexterm" name="asio.indexterm.basic_seq_packet_socket.async_send"></a> 
Start
          an asynchronous send.
        </p>
<pre class="programlisting">template&lt;
    typename <a class="link" href="../ConstBufferSequence.html" title="Constant buffer sequence requirements">ConstBufferSequence</a>,
    typename <a class="link" href="../WriteHandler.html" title="Write handler requirements">WriteHandler</a>&gt;
<a class="link" href="../asynchronous_operations.html#asio.reference.asynchronous_operations.automatic_deduction_of_initiating_function_return_type"><span class="emphasis"><em>DEDUCED</em></span></a> async_send(
    const ConstBufferSequence &amp; buffers,
    socket_base::message_flags flags,
    WriteHandler &amp;&amp; handler);
</pre>
<p>
          This function is used to asynchronously send data on the sequenced packet
          socket. The function call always returns immediately.
        </p>
<h6>
<a name="asio.reference.basic_seq_packet_socket.async_send.h0"></a>
          <span><a name="asio.reference.basic_seq_packet_socket.async_send.parameters"></a></span><a class="link" href="async_send.html#asio.reference.basic_seq_packet_socket.async_send.parameters">Parameters</a>
        </h6>
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<p class="title"><b></b></p>
<dl>
<dt><span class="term">buffers</span></dt>
<dd><p>
                One or more data buffers to be sent on the socket. Although the buffers
                object may be copied as necessary, ownership of the underlying memory
                blocks is retained by the caller, which must guarantee that they
                remain valid until the handler is called.
              </p></dd>
<dt><span class="term">flags</span></dt>
<dd><p>
                Flags specifying how the send call is to be made.
              </p></dd>
<dt><span class="term">handler</span></dt>
<dd>
<p>
                The handler to be called when the send operation completes. Copies
                will be made of the handler as required. The function signature of
                the handler must be:
</p>
<pre class="programlisting">void handler(
  const asio::error_code&amp; error, // Result of operation.
  std::size_t bytes_transferred           // Number of bytes sent.
);
</pre>
<p>
                Regardless of whether the asynchronous operation completes immediately
                or not, the handler will not be invoked from within this function.
                Invocation of the handler will be performed in a manner equivalent
                to using <code class="computeroutput">asio::io_context::post()</code>.
              </p>
</dd>
</dl>
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<h6>
<a name="asio.reference.basic_seq_packet_socket.async_send.h1"></a>
          <span><a name="asio.reference.basic_seq_packet_socket.async_send.example"></a></span><a class="link" href="async_send.html#asio.reference.basic_seq_packet_socket.async_send.example">Example</a>
        </h6>
<p>
          To send a single data buffer use the <a class="link" href="../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a>
          function as follows:
        </p>
<pre class="programlisting">socket.async_send(asio::buffer(data, size), 0, handler);
</pre>
<p>
          See the <a class="link" href="../buffer.html" title="buffer"><code class="computeroutput">buffer</code></a>
          documentation for information on sending multiple buffers in one go, and
          how to use it with arrays, boost::array or std::vector.
        </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2003-2018 Christopher M. Kohlhoff<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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